I usually put a small topping of Blue buffalo canned food on my dogs kibble. We have a Shih Tzu that doesn't like it cold so I usually nuke it for a few seconds. About a month ago, when I was warming it up, it was sparking like it contained metal. Tonight it did the small thing. This is quite concerning to me. Might not be anything, but I thought I would let everyone else know. I plan on emailing them to ask about it. I still have some of this can remaining, so I will try to see if I can get a quick video if it occurs again.